"munching" formally known as "mingling" is when girls act sexy in front of you to get attention. Their motive is to make others feel jealous and to get you to spend more money on them. It's typically seen at bars and is annoying as fuck. These girls offer nothing to society and will only have sex with you once they have you under their fucking finger. Stay away from girls who are munching.

"Hey todd did you ever get that girls number last night?"
"No she was fucking munching so I punched her in the camel toe"